A grinding method includes a step of imaging a connected workpiece by a camera in such a manner that the outer periphery of a workpiece and the outer periphery of a supporting component having a larger diameter than that of the workpiece before a step of supporting the supporting component include the connected workpiece by a holding surface is. The grinding method also includes a step of recognizing the outer periphery of the supporting component and the outer periphery of the workpiece based on the brightness difference between adjacent pixels in a captured image and a step of recognizing the center of the supporting component from the recognized outer periphery of the supporting component and recognizing the center of the workpiece from the recognized outer circumference of the workpiece.
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